I own both Zeiss and Elite 4200s, and I really can't tell you the difference between the two because they are both so great.
Mechanically, both are also top notch, although I have much more experience with the Elite 4200 and thus trust it more.
Also, the Elite has rainguard, which I really like.
The only drawbacks to the Elites are that they have shorter eye relief, and they are generally longer and heavier than comparable models.
As for the Burris, the Conquest and the Elite is just a much better scope in my experience (and I own all three.)
Zachary